field of view improvement

changed: multiple damage sources, revealed but inactive field of view sprites

the way that multiple damage sources are combined has been updated such that it isn’t ridiculously overpowered and broken. before, it would add all the dice together into one Super Die and roll that which meant that damage was massively increased by multiple dice. now each are rolled individually.

sprites that are in revealed parts of the map but are not currently in view are no longer rendered, so the player will not see enemy movement outside their active field of view